Text Document Search Macro

For this project I need to search for combinations of ASCII characters in a notepad++ document. Notepad++ already has a search function that I am aware of how to use. Despite this the amount of combinations that I need to search for is rather large so automating the search will be very helpful. All I need is a prompt to ask me how many characters are in the combination then it will search in the selected document and list all the amounts of these combinations in another text document. Now I understand how large a search can get. With just one character the program will search for 256 different characters. Some of those characters can not even be searched for so these can be skipped. However if all 256 could be searched for it means that for two characters it would be 65536 searches. I understand that something like this will take awhile to search but as long as I can see that the program is working I will be happy. I will need the program to search for up to 5 character combination as for the time being that is the most I can see me needing however if this doesn't seem possible let me know and we can work on options. I am no stranger to command prompt however I would prefer a GUI with a progress bar if possible. I have a 64 bit version of windows 7.